IBM System x3550 M4 Installation And Service Manual page 17

CAUTION:
Do not place any object on top of rack-mounted devices.
Statement 27
CAUTION:
Hazardous moving parts are nearby.
Rack Safety Information, Statement 2
DANGER
v Always lower the leveling pads on the rack cabinet.
v Always install stabilizer brackets on the rack cabinet.
v Always install servers and optional devices starting from the bottom of the
rack cabinet.
v Always install the heaviest devices in the bottom of the rack cabinet.
xv
Safety